klyne and c



C. H. KLYNE AND 0.1. BAKER.

ELECTRIC INSULATION.

APPLICATION FILED MAY l2. |917.

Patented Nov. 25, 1919.

5 SHEETS-SHEET I.

www mygw C. H. KLYNE AND C. I. BAKER.

ELECTRIC INSULATION.

APPLICATION FILED MAYI2. 1917.

Patented Nov. 25, 1919.

5 SHEETS-SHEET 2.

C. H'. KLYNE AND (1.1. BAKER.

ELECTRIC INSULATION.A

APPLICATION FILED MAY 12. 1917.

Patented Nov. 25, 1919.

5 SHEETS-SHEET 3.

M ww

C. H. KLYNE AND 0.1. BAKER.

ELECTRIC INSULATION.

APPLICATION F|LED MAY l2, 1917.

Patented Nov. 25, 1919.

SHEETS-SHEET 4.

I @www/Mm C. H. KLYNE AND C. I. BAKER.

ELECTRIC INSULATION.

APPLICATION FILED MAY I2. 1917.

Patented Nov. 25, 1919.

5 SHEETS-SHEET 5.

y 'sTA'rps 'PATENT oFFIcE.

LAD HENRY XLYNE, F SHEEBNESS, AND CHARLES JOHN BAKER, 0F WESTMI'NSTER,

" LONDON, ENGLAND. l l

ELECTRIC INSULATION.

Specification o! 'Ictiiers/Patentl Patented Nov. 25, 1919.

Application led lay 12, 1917. Serielle/168,204.

Ta all/whom t may concern: Y

le it known that we, CLAUD HENRY KLYNE, a subject of the King of Great j Britain and Ireland, and aresidentofSheerness, Kent, England, (whose post-oiceaddress is 1 Naval Terrace, Sheerness, Kent, England,) and CHARLES JOHN BAKER, a

subject of t-he King of Great Britain and l Ireland, and a resident of London, (Whose `post-cfce address is 4 Broadway Chambers,

Westminster, London, S. W.,`) England,

have invented new and useful Improved Electric Insulation, of which the following is a specification.

The presentv invention relatesto the in-V` `allat-ion of electrical apparatus and has special referenceto the application of laminated insulating material such as mica. Mica has been considered a desirable insulating its g electrical insulating properties but its use`has been owing to certain mechanical short-comings. Thus, while it can stand direct compression and shearing stresses it is not so good in resisting bendf ing stresses land moreover ithas a tendency toake.-

'One object ofthe present invention isto bind sheet mica and similar insulating materials with metal sheet to. `prevent aking;

and at the same time to use the metal binding to take the stress of the means for securing the electrical apparatus to its jbase or supporta, This is/best eiected bypassing securing bolts through the metal For this purpose the binding can be e ed at its center.

J L A further object of the invention is `to se`cure'the terminals or other metal parts 'of the apparatus to the mica. This'may be eected. directly, but itis found that a particularly stiff construction from a 'mechanical A standpoint is securedv if the binding along oneedge of the sheet is employed for anchoring or su purposes and the binding along t e other edge for securing' the terminals or other metal/parts of the apparatus. By this arrangement the inven- /tion employs mica sheets inthe edge on Yet another object of the invention is to aterial for a long time owing toj XIV-XIV of Fig. 11.

of unit switches or fuses and .the like.

Some embodiments of the present invention in its application to switch and fuse construction are shown inv the annexed drawings, in Which- Figure 1 is a plan view of a knife switch in accordance with the invention.

. Fig. 2 is a\section of Fig. 1 `on the" linea 70 II-IL f y Fig. 3 is a section on the line IIL-III. 4 is a plan of a similar construction applled to a fuse block.

Fig. 5 is a cross section of Fight on the 'liliV line V-V. f

Fig. 6 is a cross" section similar to Fig. 2, showing a slight modification. f

Fig. 7 is a side view of a brush type of switch embodying the prent invention.

Fig. 8 is a plan of the base of this switch with the. operating mechanism removed. 9 is a cross section of Fig. 8 on the line IX-I Fig. 10 is Fig. 11 is a side view of a fuse constructedin accordance with the invention. l 12isaplanofsame.

Fig. 13 is. a cross section on the line 90 XIII-XIII) ,of Fig. 11.

14 is a cross section on the li/ne Fig; 15 isa 'perspective view from the inside of'one of the plates of 11 to '14. 95

Figs. 16 and 17 are respectively side view and end view of a fuse fitting in accordance with the invention with the fuse in potion.

perspective viewl of the metal f binding strips employed in Figs. 7 to 9,

n :beamer-7 Figs. 18( and 19 are similar views of a double platefuse construction with the fuse removed. f

Fig. 20 is afside view cfa switch embody- Y ing the invention, and

v 145 shape. The strips ofbrass in their middle portion. have extensions, the left vhand' one extending below 'the mica sheets and that on the right extending above as seen at 3 in Figl 1. Bolts 4 passing through these brass ex- I tensions serve for securing the insulating base to the stout metal plate or strip 14 pro-A vided with holes for securing the switch in position. In\such a construction as this it is not necessary' for the ends of the sheets of mica to be bound with metal, but it isdfound suflicientf to secure: the long sides of the layers. vThe fixing strip 14 can be` of any lengthin order to accommodate any `desired numb 'r of switch unitsside by side.

Th metal contacts .of the switch are shown at 5. They are secured to themlica itself b screws which pass through. the latter. T is provides quite a satisfactory? construction owing to the capacity of mica for f resistin the tearing l'cutf these screws.

' The switch blade 6 and the-handle 7 are of known construction.

Figs. 4.and 5`show a fusie block which is very similar in construction to the above de- 40 scribed switch. vCorresponding` reference characters are used for corres nding parts inthe two devices. The metalloterminals 51 of the fuse' have extensions. Safor securing i the circuit Wires, and as. Ithe particular con- 46 struction shown is designedffor u se in damp f locations, at either end 0of.' the insulating base the brass bindin A strips are covered by. a sheet of linica. 9, wit a spacing or backing piece of mica 10.1between'the covering sheet 50 9 and the base mica 1.. The effect of this ismerely give a llong leakage path t0- counteract the effect of the conductivity of moisture gathering on the insulating base. Fig. 6`shows a mo ication in'whichhin the pressing the ybrass vbinding strips 2 are "formed with a web to make them of so v called girder section in order' toPwithstand the bending stress to which they'may. be subjected more particularly in large switches and the like. This construction has thefnrthen most important advantage thatthe npstanding ridges on the brass strip 2 serve as a protection for `the mica sheet 9. In Figs. 7 to 10, thelinvention is shown applied to a brush type switch. The baseis 319,1 vare vbound of which can be best seen `from Figs. 411 and best seen in Fig. 7. The' layer of mica'l has the brass binding strips 2 andat one end these are covered with a sheet oflmica 9 for the purpose. described in .connection with 4. rIn this instance, however, instead 70 of appging over the brass strips at 'their middle portion 'each'of the strips at one end is lbentatright angles tothe basey in order to form a pairvof upstanding lugs or ears 11.v These lugs are" drilled et 13 to take the pivot 75 of the jswi'tch handle 7, which, in known' manner, carries the bridge member ofthe switch and the brushesl. In this construction there is also shown aninsulating shield 15.between the lugs 11 and consisting of a 80 Sheet of mical turned upa't either side.

f In the construction vshown in Figs. 11 to 15 a pair of mica plates of desired thickness 1, used the lower edges of each being by sheet metal 2, they configuration 85 15. These lower binding stri s serve to secure the compound plates to t e supporting base (not shown) As seen in Fignl on the inside of each strip a tongue 17- 1s cutaway -'90 and bent over; 'througlf each Noff these tonguesa bolt 4 passes and serves 'to secureA the device tothe base. t l

In this particular construction the binding A ofthe upper edge is'reduced to a minimum 95 and consists of strips- 18. On these strips the plates 19jare secured by means of screws, and on the pla-tes 19 the fuse clips 20 are secured. e

f In this construction and in all constructions in`whichfmorethan one unit of metal and mica is employed the complete structure forms theequivalent of a' beam of box girder section. In Figs. 16 and 17, however, which show only a single compound sheet the con.- 106 struction is equivalentto an I girder. In this construction the lower edge of the mica sheet 1 is embraced by ariveted metal sheet 2, the configuration of which will be best fr seen in Fig'. 16. Here again the binding, 110 strips 18 of the upper edge are insignificant v 1n comparison with the lower binding 2.

In connection with the shapes. of these binding strips it should be pointed out that the rivets 21 are so disposed and 'the edges 115 'of the strips so shaped that it is very chilicult'to choose a line of vbendin over' theA face of the compound .sheet w 'ch shall pass'over mica alone1 If practically any straight line isdrawn' right? sheet it will be found topass through a portion of metal, so that the vresistance to bending ofthe ,whole device is increased in this The plates 19 vand the-fuse clips`20 are 125 secured in substantially'the same way as in previous construction. In this case, however, the fuse 22'isy shown in position.' This articularl construction is specially designedso theta number of fuses canbe'lao through the arranged in line side'` by side and itis .intended that this construction be assembled by drilling the binding strips 2 and threading a number of these-units upon a metal 5 supporting. or assembling. rod or rods 23.

w The same remark appllesto the next construction shown in Figs. 18 and 19, except that it -is'convenient here to mount the device on a pair of long supporting or assembling rods 24, 25. Thus, this construction otherwise is Ithe same with that shown in Figs. 16 and 17 with' the following two small exceptions: The configuration of theibinding strips 2 vand 18 is slightly diiferent and two mica sheetsl and 1a are employed. In, Figs. 20 Aand 21, a switch construction is illustrated. The two compound sheets of metal and mica are very lsimilar to those shown in the fuse base of Figs. 18 and'19. 20 The switch itself is of a known type with a Acarbon break andc need not be` described in detail, except that it should be mentioned the switch handle is pivoted in upstanding i brackets 31 which are formed'from a metal `sheet continuous from the base and secured to `the binding strip 2.v This sheet 31 is secured to the strip 2 by screws 26 and to the base of the apparatus byy screws 27, and

therefore serves asa means for securing thev bindingstrip '2 rto thef base of the appa- `ratus. Y l v The invention is only 'illustrated in connection with switches and fuse blocks, but can be applied to .mica or similar insulating material/when the latter is used for the in*-J -sulationfof other electrical apparatus. The outstanding'advantage of lthe invention re' sides in the fact that the construction lends itself to the manufacture 'ofu'nits capable 40 of standardization and extremely easy to asf semble in any numbers in any combination lwhich may be required in practice.

What I claim is 1. In combination, a sheet of insulating Y material of small mechanical strength, Strengthening metal binding surrounding an edge of said s heet,vmetal parts secured upon said sheet not in contact with rsaid blnding, and supporting means engaging vsaid binding.. Y 2. Inmeansfor. insulating electrical apparatus, the `lcombination of a sheet of mica rewceiving the terminals of said apparatus, metal binding gripping the longitudinal edges of said mica sheet, and` anchoring bolts assin through said metal binding.

3. n com inatidn, a strip of mica, metal p arts .fastened thereon and adapted to be subjectedto mechanical forces and electrical 50 pressures, a support, and metal binding engaging said support, and folded around anof the two sheets into girder form.

redge of said strip and extending-into .prox- Y 'lel'mica sheets, metal binding strips along the longitudinal edges thereof and means mechanically/uniting each bindin strip of one sheet to the corresponding bin .ing strip of the other so converting the whole into a box girder.

6. In combination, a sheet of mica, vsheet metal strips engaging one .edge j thereof, metal parts mounted upon said strips and\ adapted`t'o be subjected to mechanical stress chiefly in the plane of the sheet, sheet metal engaging opposite edge of said sheet of mica, and supporting means engaging-said last mentioned sheet metal. v7.An installation of insulators for electrical circuits comprising a plurality of parkallel sheets of insulating material, metal binding-gripping the longitudinal edges of said sheets and an assembling rod passing Y through corresponding vparts of'the metal binding of all the sheets.

8. `Inclectrical apparatus the combination of a sheet of mica, and separate metal binding strips along opposite edges thereof, and said strips being extended .overthe surfacek of said mica and having sinuous free edges intermeshing with but not touching each other.

9. In electrical apparatus the combination of two parallel sheetspf mica, metal bindingstrips engaging the' edges of said sheets of mica, and means uniting the binding strips 1 0. As an electrical insulating support, an elongated strip of mica, separate metal bindings folded around opposite edges of said strip, and extensions onl said bindings spreading over said Sheet toward the oppo- 110 site edge, the extensions from one edge intermeshing with but not touchiiig the extensions from the other. f f

In, testimony whereof we sign our. names to this specification in the presence of two 11,5 subscribing witnesses.

CLAUD HENRY KLYNE. CHARLES OI-IN BAKER.

Witnesses f f EDWARD C. FAYER,

Sr. G. HUGHES. 

